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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

low compression cylinder #2

Old 03-26-2016, 02:14 PM
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low compression cylinder #2

I have a 92 with a 3.0L V6. I just bought it a month ago and it didn't seem to be well maintained. I replaced the exhaust, cap, rotor, plugs, wires, timing belt, and water pump. The pickup has exactly 200,000 miles. After doing all of this it still didn't seem to run quite 100% so i did a compression test and cylinder #2 was reading 40psi. Do you think it could just be that the valves need adjusted or reshimmed? I am new to toyotas so i thought i would get some opinions. Thanks
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Old 03-26-2016, 04:28 PM
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It may well be that you will find that there is little, or no, valve clearance on your weak cylinder.

It is not likely though, that restoring the valve lash would restore the compression.

As the lash diminishes, the valve loses its ability to seat long enough to cool, and then it burns.

Most likely, only a valve grind job will restore your weak cylinder.
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